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(No Model.)

D. LU/BIN.

ENVELOPEq No. 257,352. Patented-May 2,1882.

N. PETERS. Phnwbmugmphcr. wnshngmn. uc;

UNITED PATENT OFFICE.

DAVID LUBIN, or sAonAMENroeIrY, CALIFORNIA, Assienon or oNnHALF To HAnnIs wnnvsroeK, or sAME PLAeE.

ENVELOPE.

SPECIFICATION forming part of Letters Patent No. 257,352, dated May 2, 1882,

Application filed January 31, 1882.

To all whom t may concern: I

Be it known that I, DAVID LUBIN, of Sacramento Gity,in the county of Sacramento, and in the State of California, have invented certain new and useful Improvements in Envel opes; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference 1o marked thereon, makinga part of this specification.

This invention relates to letter-envelopes which are especially designed for containing valuable matter transmitted through the mail;

and the nature of my invention consists in providing the closing or sealing iiap of an envelope with a fringed edge cemented to a very thin lstrip of tissue-paper, the inside surface of which is coated `with a suitable mucilage or 2o cement for sealing the free edge of the flap to the back ofthe envelope, as will be hereinafter explained. l

In the annexed drawings, Figure lis a view of the back of my improved envelope, the closing-flap of which is provided with a fringe, the slips of which are of a serpentine form. Fig. 2 is a similar view of an envelope, the closing-iiap of which is provided with a zigzag fringe and a straight fringe, these being modiiications of the serpentine fringe. Fig. 3 is a sectional view. Y

rIhe following description of my invention, when taken in connection with the annexed drawings, will enable others skilled in the art to understand it.

A designates the envelope, havingfour back flaps, three of which, lettered B, C, and D, may be shaped and cemented together by their edges in the usual well-known manner. The

iiap E, which Idenominate the closing-flap, may be made with a straight edge extending from end to end of the envelope, as shown. By means of suitable machinery the straight edge of the flap E is fringed, as indicated by the letter G. The fringe is broadly cut, and the slips a are separated from each other by narrow spaces.

The fringe-slips ay may be of a serpentine (No model.)

form, they may be zigzag, or they may be straight, or of any other suitable shape. 5o

Instead of having the slips a of a uniform length, as shown in the drawings, Fig. 1, I prefer to have, say, every alternate slip eX- tend into the Hap E deeper than the intermediate slips, as indicated at b, Fig. 2. By these means it will be impossible to open an envelope by cnttin g through the iiap E above the fringe, and to seal the cut portion to its place again, without the fact of its having been tampered with clearly appearing. 6o

Having produced the fringe, as described, I neatly paste or cementto the inner side thereof a strip, c, of very thin tissue-paper, leaving every slip a adhering firmly to said strip c, and all ofthe slips as nearly parallel to each other 55 as possible. The slips are thus connected together by very thin and frail webs of tissuepaper. The inner side of the strip c is then coated with a suitable cement, by moistening which the fringed edge of the closing-flap E 7o i can be causedto adhere firmly to the bacl; of the envelope.

Fig. 2 shows the free ends of the slips a extended a short distance beyond the edge of the tissue-paper backing. By this constrnction the extremities of the slips can be brought in direct contact with and cemented to the back of the envelope, which will afford additional security against a successful tampering with the envelope. 4 8o It' it is desired to apply my invention to angular fiaps, this maybe done by having narrow fringe-seals on the oblique edges of the closing-naps and an intermediate fringe-seal at the central angle of said flaps. These fringeseals will be made substantially as described for the straight-edge iiaps. It is obvious that instead of leaving spaces between the slips of the fringe the fringe may be formed by simply slitting the paper. A9o

Having described my invention, I claiml. An envelope having its closing flaps fringed, as described, and a tissue paper backing cemented to the fringe, substantially as described. A 95 2. An envelope having slips n, of different lengths, formed on iis flap, and n tissue-paper In testimony whereof I affix my signature, backing cemented to said slips, for the puriu presence of two Witnesses, this 30th day of pose substantially as described. January, 1882. j

3. An envelope having its closing flap DAVID LUBIN. 5 fringed and the ends of the slips aextended Witnesses:

beyond the tissue-paper backing sealed to the I H. AUBREY TOULMIN, fringe and gummed,substnntinily as described. J. J. MCGARTHY. 

